Does anyone know how to permanently change the default file extension in Abiword 2.8.6?

I've found many references on the web to do this and I have attempted to follow the examples.
See screenshot below.
I know that a personal template can be created.
However, what I am looking for is a permanent change to the program's file extension default of .abw, .zabw, abw.gz.
I would like the program always to open to a .pdf extension as the default (I'm willing to accept .rtf if .pdf won't work for some reason).

2. I notice that you edited a language-specific profile. I don't know when or if those profiles are used by the Linux flavor of abiword. If you know that system.profile-en works for you, then that's fine, but I needed to use the non-language-specific system.profile file.

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